Device for controlling a reverse time of a manuscript carriage, etc. for electrographic apparatuses

Abstract

A device for controlling a reverse time of a manuscript carriage, etc. for electrographic apparatuses is disclosed. The device comprises means for disengaging a forward movement electromagnetic clutch from a manuscript carriage or optical system driving mechanism and, after a lapse of time from the moment of disengaging the forward movement clutch from the manuscript carriage or optical system driving mechanism, for driving a backward movement clutch. The device is capable of effectively prevent the backward movement clutch and a carriage supporting plate, etc. from being subjected to heavy load and of effecting a reciprocal movement of the manuscript carriage or optical system in a smooth manner.

What is claimed is: 
     
       1. A device for controlling a reverse time of a manuscript carriage and the like for an electrographic apparatus having an electric circuit including a direct current supply source, a start switch means including: a first relay, said start switch means and first relay being connected in series across said direct current supply source, a change-over switch operatively associated with a projection secured to the lower surface of a manuscript carriage and connected through a contact arm of said first relay, and a contact arm of said change-over switch connected to a first contact point thereof in parallel with said start switch, a second relay connected through a normally closed switch operatively associated with said projection and a contact arm of said second relay across said direct current supply source, a timer circuit connected to a contact arm and to a second contact point of said change-over switch and to a connection point between said normally closed contact arm and said contact arm of said second relay, said timer circuit having a time constant of several hundreds milliseconds, a forward movement electromagnetic clutch connected through a contact arm of said first relay across said direct current supply source, and a backward movement electromagnetic clutch connected through a contact arm of said second relay across said direct currect supply source.